who buys high octane motor fuel and why?
Is high octane fuel just a hold-over from the days of carburaetors or are there vehicles that need it?
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Use the cheapest gas your engine will run on.
Two years ago the Benz engines required High test gas-very dumb status symbol.
At least some newer engines have variable cam and ignition timing to sense preignition and compensate for it.
Unless you need all possible power from your engine, use lower octane fuel, provided ir runs well.0 -
Many factory supercharged or turbod cars require 91 octane. 0 -
High compression engines and low octane fuel result in the fuel exploding BEFORE the spark. Higher octane fuels resist the early detonation better than low octane. In recent years, MOST engines are calibrated to run on regular 87 Octane. Incidentally, the higher altitude in Colorado lowers the effective compression ratio of engines- regular gas sold there is 85 octane. Higher octane fuels do not burn cleaner, or give more energy- they are actually a tad harder to ignite than lower octanes. Unless you have an engine specifically designed to run on higher octane fuels, you are wasting cash. If it was designed for regular, and you NEED to burn higher octane to prevent knocking or pinging, likely you need some maintenance. I still keep some 115/145 around for the helicopter- but that is a very high compression injected engine. 0 -
Only when I supertune my F-150 4X4 for performance. Otherwise I use 87 for daily travel.[8D] 0 -
Only certain hi performance motors need it anymore.
The Vette only requires 89 octane.
We had a Turbocharged Eclipse, it HAD to have 91.
The 73 Mustang runs 91octane because of it's 10.5:1 compression ration, sometimes we buy that 105 fuel.0 -
I have a '56 Chevy with a mid-'60s 327 that has around 10:1 compression, and it even will do some pinging on the highest octane I can find at ordinary gas stations. I have to keep the timing cranked down to avoid the ping. 0 -
My Charger Hemi Daytona specifies 87 Octane but I have it tuned with the SuperChips Performance tuner to use 91 Octane. 0 -
octane need is related to compression and cylender pressure. todays cars rarely need anything more than 87 octane. in fact, running higer makes them run worse. also, MAJOR misconception is that higher octane makes cars run cleaner....not true. some new cars that have turbos or higher compression suggest 91 octane. i have had many many race cars where i used everything from 87 - 116 octane. 0 -
[/quotecmd66
Member
USA
583 Posts
Posted - 04/03/2007 : 12:50:52 PM
Hey Tailgunner. Yatta yatta yatta. And you just might be a moron?
"From my cold dead hand's"
][:D][:D][:D] yep0 -
quote:some new cars that have turbos or higher compression suggest 91 octane
Just like the Toyota Sienna, Nissan Quest and Honda Odyssey minivans, one of the reasons I bought a chevy minivan insted of the other's is that it uses regular unleaded.0 -
I have a 2006 Nissan Extera w/ supercharger and it goes like a mutha on anything i feed it. gets slightly better mileage when pulling and burning 91. besides that it gets the cheap S!it. 0 -
I put a turbo on my 5.7 hemi ram and it requires at least 91 octane, but I normally use 93 to prevent detonation on boost. 0 -
I recently heard a guy say he puts jet fuel in his motorbike when he stores it, he said the jet fuel has a longer shelf life. 0 -
my lambo knocks like a sob if I put regular fuel in it.
Ben0 -
quote:Originally posted by mrseatle
I recently heard a guy say he puts jet fuel in his motorbike when he stores it, he said the jet fuel has a longer shelf life.
Isn't jet fuel something like kerosene? He might have a hard time starting it when he takes it out of storage.[:D]0 -
my 85 gmc truck has a 383ci small blk stroker it will not run on cheap[low] octane and the comp ratio is 9:1 it spark knocks bad enough to cause engine damage,it puts out 425hp-450lb ft of torque it really runs good on half 92/115 mixed, the burban with its crate 454 -425hp-500lb ft has 10:5 and it loves only high oct. i wouldnt recommend letting your engine ping/spark knock/early detonation,you will pay dearly in the end [:D]sadly they both are toys that are getting more expensive to drive,[V] 0 -
quote:Originally posted by Dak To 68
I'm not an expert on gasoline, but I had a supercharged Regal GS that was supposed to use the high octane fuel. I got tired of paying a lot more for fuel and started burning 87 octane and put 40,000 miles on it with no apparent loss of power or economy. The person I sold it to has 80,000+ on it now with no problems.
One good series of detonations and that engine is gone. Detonations in supercharged or turbod engines kill them quick.0 -
quote:Originally posted by PC800
One good series of detonations and that engine is gone. Detonations in supercharged or turbod engines kill them quick.
PC800,
That may very well be so. I ran a multi line GM dealership for quite some time, and I know others that have run 87 octane in these supercharged 3800 V6 engines, and can't remember any in the service department with problems caused by that. The one I mentioned is right down the street, it has 80,000+ on it, almost all of it on 87 octane, and still going strong. I recently sold my '05 Corvette, I always burnt the highest octane in it, and it's not 'charged, different animal.[;)]0 -
yep!!!!!!!!!!
quote:Originally posted by cmd66
Hey Tailgunner. Yatta yatta yatta. And you just might be a moron?[:0]0 -
quote:Originally posted by Dak To 68
quote:Originally posted by PC800
One good series of detonations and that engine is gone. Detonations in supercharged or turbod engines kill them quick.
PC800,
That may very well be so. I ran a multi line GM dealership for quite some time, and I know others that have run 87 octane in these supercharged 3800 V6 engines, and can't remember any in the service department with problems caused by that. The one I mentioned is right down the street, it has 80,000+ on it, almost all of it on 87 octane, and still going strong. I recently sold my '05 Corvette, I always burnt the highest octane in it, and it's not 'charged, different animal.[;)]
Thats good to know about that engine, I do know it has a great rep for strength and long life. Friend has an Bonneville SSi and the local GM dealership has told him repeatedly that he must run 91 or higher in it due to the blower, to guard against detonations.0 -
My sons Piper Cub requires 102 Octane or better![}:)] 0 -
PC800,
Regal GS and the Bonerville SSei are mechanically the same beast. It's in the owners manual and on the dashboard to burn the high octane, probably for a reason. No service personnel would advise a customer to do something not recommended by the manufacturer. Like I said though, I've not seen a problem with 87 in them. That doesn't mean it's never happened.[;)]0 -
I have always heard that burning lower than recomended octane gas would mess up the cat converter(s).
Pete0
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